package com.ruoyi.order.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP = 1640995200L;

    private static final int COUNT_BITS = 32;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

   public long nextId(String keyPrefix){

       // 1.生成时间戳
       LocalDateTime now = LocalDateTime.now();
       long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
       long timestamp = nowSecond - BEGIN_TIMESTAMP;

       // 2.生成序列号 -- 自增长
       // 2.1.获取当前日期，精确到天
       String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
       // 2.2.自增长
       long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
       return timestamp << COUNT_BITS | count;
    }

}
